Unlock instant, AI-driven research and patent intelligence for your innovation.

Calcination apparatus, process for producing oxide catalyst, and process for producing unsaturated acid or unsaturated nitrile

a technology of oxide catalyst and calcination tube, which is applied in the direction of physical/chemical process catalyst, gas-gas reaction process, furnace, etc., can solve the problems of reducing catalytic performance, air infiltration into the calcination tube, and inability to maintain the inert gas atmosphere, so as to achieve an increase in the yield of the product

Active Publication Date: 2014-01-23
ASAHI KASEI CHEM CORP
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a calination apparatus that can maintain an atmosphere for long-term operation. It has a process for continuously producing a catalyst which has a higher yield of the desired product. The catalyst can be used to produce unsaturated acid or unsaturated nitrile.

Problems solved by technology

Unfortunately, the present inventors have found that: although brief calcination has enabled the inside of the kiln to be kept under an inert gas atmosphere, due in part to deterioration of a sealed portion by rotation of the kiln, etc., long-term operation has caused air to infiltrate into a calcination tube and an inert gas atmosphere has been unable to be maintained.
This has resulted in decreased catalytic performance.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Calcination apparatus, process for producing oxide catalyst, and process for producing unsaturated acid or unsaturated nitrile
  • Calcination apparatus, process for producing oxide catalyst, and process for producing unsaturated acid or unsaturated nitrile
  • Calcination apparatus, process for producing oxide catalyst, and process for producing unsaturated acid or unsaturated nitrile

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0163]A silica-supported catalyst whose composition formula was represented by Mo1V0.24Nb0.095Sb0.27W0.031Ce0.005On / 45 mass %-SiO2 was produced as follows.

(Preparation of a Raw Material Mixture)

[0164]32.5 kg of ammonium heptamolybdate [(NH4)6Mo7O24.4H2O], 5.13 kg of ammonium metavanadate [NH4VO3], 7.23 kg of diantimony trioxide [Sb2O3], and 0.404 kg cerium nitrate [Ce(NO3)3.6H2O] were added to 133.4 kg of water, and heated under stirring at 95° C. for 1 hour to thereby obtain an aqueous mixed liquid A-1.

[0165]3.94 kg of a hydrogen peroxide solution containing 30% by mass of H2O2 was added to 29.3 kg of the niobium raw material liquid. The mixture was stirred and mixed at a liquid temperature being held at about 20° C., to thereby obtain an aqueous mixed liquid B-1.

[0166]The aqueous mixed liquid A-1 was cooled at 70° C., and 58.60 kg of a silica sol containing 30.4% by mass in terms of SiO2 was thereafter added. Then, 8.39 kg of a hydrogen peroxide solution containing 30% by mass of ...

example 2

[0172]A silica-supported catalyst whose composition formula was represented by Mo1V0.24Nb0.095Sb0.27W0.031Ce0.005On / 45 mass %-SiO2 was produced as follows.

(Preparation of a Raw Material Mixture)

[0173]A raw material mixture was prepared as in Example 1, except for preparing about 640 kg of the total of the raw material mixture by repeating eight times the present step in order to carry out a step of “preparation of a dried catalyst precursor” and a “calcination” step in a continuous system.

(Preparation of a Dried Catalyst Precursor)

[0174]The raw material mixture obtained was fed and dried in a centrifugal-type spray dryer to thereby continuously obtain a fine spherical dried catalyst precursor. The inlet temperature of the dryer was 210° C.; and the outlet temperature was 120° C.

(Calcination)

[0175]The same calcination apparatus as in Example 1 was used, except that the calcination apparatus had: a calcination tube 1 described below; a pair of hoods 2 (which were each of a cylindrical...

example 3

[0178]A catalyst was prepared as in Example 1, except for making the pressure P1 in the specific space to be 0 mmH2O and the pressure difference P2 between the specific space and the sealed chamber to be 60 mmH2O, and the catalyst performance was evaluated as in Example 1. The results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Fractionaaaaaaaaaa
Temperatureaaaaaaaaaa
Pressureaaaaaaaaaa
Login to View More

Abstract

Disclosed is a calcination apparatus, including: a calcination tube having open ends at both terminals; a pair of hoods, each hood covering each open end of the calcination tube; and a pair of rings, each ring sealing a gap between the calcination tube and the hood, wherein the rings are directly or indirectly fixed on an outer surface of the calcination tube; a groove is provided along a circumferential direction of the ring at a contact surface side between the ring and the hood; a sealed chamber surrounded by the hood and the groove is formed; and both the calcination tube and the rings rotate in a circumferential direction of the calcination tube while keeping the hood in contact with both sides of the groove.

Description

TECHNICAL FIELD[0001]The present invention relates to calcination apparatuses, processes for producing an oxide catalyst, and processes for producing an unsaturated acid or an unsaturated nitrile.BACKGROUND ART[0002]Previously, processes for producing corresponding unsaturated nitrile by gas phase catalytic ammoxidation of propylene have been well known. However, a process has recently drawn attention, the process in which corresponding unsaturated nitrile is produced by gas phase catalytic ammoxidation using propane as a substitute for propylene. A large number of catalysts used have been proposed.[0003]Patent Literature 1 discloses an ammoxidation catalyst for propane as a feedstock, the catalyst containing Mo, V, and Nb. With regard to this catalyst, it has been known that a calcination atmosphere is preferably kept under an inert gas atmosphere during a step of subjecting a catalyst precursor to calcination in view of catalytic performance.Cited List[0004]Patent Document 1: Japa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J19/24C07C253/24B01J23/28
CPCB01J19/2415B01J23/28C07C253/24B01J6/004B01J2219/00157B01J2219/00162B01J2523/00F27B7/24F27D99/0073C07C255/06B01J2523/53B01J2523/55B01J2523/56B01J2523/64B01J2523/68B01J2523/3712B01J2523/41B01J2523/69B01J2523/72B01J2523/305B01J2523/31B01J2523/47B01J2523/57B01J2523/54B01J2523/3787B01J2219/24
Inventor TATENO, ERIKANETA, MASATOSHIFUKUZONO, TOSHIHIKOWATANABE, HARUHIKO
Owner ASAHI KASEI CHEM CORP